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An in-situ data is the data collected that is associated with measurement has the exact measurement of the actual location.  An example of this would be when collecting Remote sensing data, in-situ data will be used to verify that the measurement of the data collected will be the same as the actual location.
- "Glossary." Physical Oceanography: Distributed Active Archive Center. Jet Propulsion Laboratory, n.d. Web. 16 Jan. 2013.